Question about Z16 Chevelles

[70 Forest Green Zee]

After looking at the Z16 Chevelle listed on Ebay I went back and looked at the one that sold in Jan from the Rick Treworgy collection. I always thought that the VIN #s would be sequential with only 201 cars being produced, but apparently that is not the case. The VIN from the Ebay car is 138375K175146 and the VIN from the Treworgy car is 138375K169577. That is a span of 5569 cars. If these two cars are both legit, is it possible that they made a certain amount of Z16's then went on to other cars, then went back to making Z16's again and finished up the run of 201 cars?